diff --git a/impls/tests/step3_env.mal b/impls/tests/step3_env.mal
index 1a84d442d4..5e77c4666f 100644
--- a/impls/tests/step3_env.mal
+++ b/impls/tests/step3_env.mal
@@ -14,6 +14,12 @@ x
 ;=>4
 x
 ;=>4
+(def! x nil)
+x
+;=>nil
+(def! x 5)
+x
+;=>5
 (def! y (+ 1 7))
 ;=>8
 y
@@ -44,7 +50,7 @@ w
 (let* (x 9) x)
 ;=>9
 x
-;=>4
+;=>5
 (let* (z (+ 2 3)) (+ 1 z))
 ;=>6
 (let* (p (+ 2 3) q (+ 2 p)) (+ p q))
diff --git a/impls/tests/step4_if_fn_do.mal b/impls/tests/step4_if_fn_do.mal
index b98f2dae2a..aeab17b3f1 100644
--- a/impls/tests/step4_if_fn_do.mal
+++ b/impls/tests/step4_if_fn_do.mal
@@ -202,6 +202,15 @@
 (plus7 8)
 ;=>15
 
+;; Testing lexical function scope binds names (not values)
+(def! a 12)
+(def! fx (fn* () a))
+(fx)
+;=>12
+(def! a 2000)
+(fx)
+;=>2000
+
 ;; Testing do form
 (do (prn 101))
 ;/101